The Merrell Down & Dirty National Mud and Obstacle Series presented by Subaru will make a second visit to the Windy City on May 20th, 2012!

This year Chicago's Pop/RB Chameleon, Troy D., will be opening the event with the National Anthem.

If you haven't heard already, the rising Chicago RB/Pop star will be performing live in Las Vegas at Rumors Boutique Hotel on June 23, 2011.